1. Nov 15, 2011 #1

   brotherbobby

   

   I read from a book that the "total energy is not preserved when the potential depends explicitly on time", i.e. U(x,t). Can anyone show or prove it?
   
   Many thanks.

    

   brotherbobby, Nov 15, 2011
2. 
   Phys.org - latest science and technology news stories on Phys.org

   • • Imaged 'jets' reveal cerium's post-shock inner strength
   • • Exciting silicon nanoparticles
   • • How many ways can you arrange 128 tennis balls? Researchers solve an apparently impossible problem
3. Nov 17, 2011 #2

   McLaren Rulez

   

   Total energy will be conserved. What happens is that you will be spending some energy in changing the potential U.
   
   For instance, consider the potential energy of some test charge, T, placed near some charged particle, A. Of course the potential energy of T will change if you move particle A around. So, in that sense, the test charge's energy is changing. But anything you lose or gain will be covered by the energy used in moving particle A.

    

   McLaren Rulez, Nov 17, 2011

• Log in with Facebook
• Log in with Twitter

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in